package com.anlu.base.common.log.utils;

import cn.hutool.core.util.URLUtil;
import cn.hutool.extra.servlet.JakartaServletUtil;
import cn.hutool.extra.spring.SpringUtil;
import com.anlu.base.common.log.event.SysLogEvent;
import com.anlu.base.common.log.event.SysLogEventSource;
import jakarta.servlet.http.HttpServletRequest;
import lombok.experimental.UtilityClass;
import org.springframework.core.StandardReflectionParameterNameDiscoverer;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.http.HttpHeaders;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.lang.reflect.Method;
import java.util.Objects;

@UtilityClass
public class SysLogUtils {


    public SysLogEventSource getSysLog() {
        HttpServletRequest request = ((ServletRequestAttributes)Objects.requireNonNull(RequestContextHolder.getRequestAttributes())).getRequest();
        SysLogEventSource sysLog = new SysLogEventSource();
        sysLog.setLogType(LogTypeEnum.NORMAL.getType());
        sysLog.setRequestUri(URLUtil.getPath(request.getRequestURI()));
        sysLog.setMethod(request.getMethod());
        sysLog.setRemoteAddr(JakartaServletUtil.getClientIP(request));
        sysLog.setUserAgent(request.getHeader(HttpHeaders.USER_AGENT));
        sysLog.setCreateBy(getUsername());
        sysLog.setServiceId(SpringUtil.getProperty("spring.application.name"));

        return sysLog;
    }

    /**
     * 获取用户名称
     * @return username
     */
    private String getUsername() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if (authentication == null) {
            return null;
        }
        return authentication.getName();
    }
    /**
     * 获取spel 定义的参数值
     * @param context 参数容器
     * @param key key
     * @param clazz 需要返回的类型
     * @param <T> 返回泛型
     * @return 参数值
     */
    public <T> T getValue(EvaluationContext context,String key, Class<T> clazz){

        SpelExpressionParser spelExpressionParser = new SpelExpressionParser();

        Expression  expression = spelExpressionParser.parseExpression(key);

        return expression.getValue(context, clazz);
    }

    /**
     * 获取参数容器
     * @param arguments 方法的参数列表
     * @param signatureMethod 被执行的方法体
     * @return 装载参数的容器
     */
    public EvaluationContext getContext(Object[] arguments, Method signatureMethod){
        String[] parameterNames = new StandardReflectionParameterNameDiscoverer().getParameterNames(signatureMethod);

        EvaluationContext context = new StandardEvaluationContext();
        if (parameterNames == null) {
            return context;
        }
        for (int i = 0; i < arguments.length; i++) {
            context.setVariable(parameterNames[i], arguments[i]);
        }
        return context;

    }
}
